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A value of kLa = 30 h-1 has been determined for a fermenter at its maximum practical agitator
rotational speed and with aie being sparged at 0.5 L gas / L reactor volume-min. E. coli with
a qO2 of 10 mmol O2/g-dry wt-h are to be cultured. The critical dissolved oxygen concentration
is 0.2 mg/L. The solubility of oxygen from air in the fermentation broth is 7.3 mg/L at 30°C.
a) What is the maximum concentration of E. coli that can be sustained in this fermenter
under aerobic conditions?
b) What is the concentration could be maintained if pure oxygen was used to sparge the
reactor?
rotational speed and with aie being sparged at 0.5 L gas / L reactor volume-min. E. coli with
a qO2 of 10 mmol O2/g-dry wt-h are to be cultured. The critical dissolved oxygen concentration
is 0.2 mg/L. The solubility of oxygen from air in the fermentation broth is 7.3 mg/L at 30°C.
a) What is the maximum concentration of E. coli that can be sustained in this fermenter
under aerobic conditions?
b) What is the concentration could be maintained if pure oxygen was used to sparge the
reactor?
Calculate the pH of each of the cases in the titration of 25mL of 0.1M of pyridine with 0.1M HBR.
Calculate before addition of any HBR
After addition of 12.5mL
After addition of 18.0mL
After addition of 25.0mL
After addition of 30.0mL
Calculate before addition of any HBR
After addition of 12.5mL
After addition of 18.0mL
After addition of 25.0mL
After addition of 30.0mL
Use the Clausius-Clapeyron equation to calculate the vapor pressure for the following samples. Assume the amount of each sample is 1 mole.
a. Water at 63 C.
b. Ethanol at 23 C.
c. Chloroform at 52 °C.
a. Water at 63 C.
b. Ethanol at 23 C.
c. Chloroform at 52 °C.
8. If the average soda contains 0.14 moles of carbon dioxide per liter of solution, what conditions (temperature) would be required to increase the internal pressure of a 2- liter bottle of soda to 8.25 atm? Make sure to account for the vapor pressure of water in your calculations.
NOTE: Assume the 2-liter bottle is filled with 2 liters of carbonated water and 50 mL of air.
NOTE: Assume the 2-liter bottle is filled with 2 liters of carbonated water and 50 mL of air.
What kind of bond is form energy between carbon and hydrogen in CO2
Explain two ways in which the laboratory procedure can be improved. The
improvement should result in either a better separation of the components (improved
purity of the final residues) or a more complete recovery of the components (less loss of
the material). Note that a suggestion to follow the instructions or use proper techniques
will not be considered an acceptable answer.
improvement should result in either a better separation of the components (improved
purity of the final residues) or a more complete recovery of the components (less loss of
the material). Note that a suggestion to follow the instructions or use proper techniques
will not be considered an acceptable answer.
Explain in detail why the sum of the masses of the three residues is different from the
mass of the original mixture used for the experiment.original mass of mixture is 5.0764 f and total mass of three components if 4.0792 g
mass of the original mixture used for the experiment.original mass of mixture is 5.0764 f and total mass of three components if 4.0792 g
Geologists use the decay of potassium-40 in volcanic rocks to determine their age. Potassium-40 has a half-life of 1.26 x 10⁹ years, so it can be used to date very old rocks. If a sample of rock 3.78 x 10⁹ years old contains 2.73 x 10⁻⁷ g of potassium-40 today, how much potassium-40 was originally present in the rock? *
Explain in simple words Corrosion due to oxygen
How many grams of H2O are produced by the complete combustion of 3.0 x 10² g of octane, C8H18 in gasoline?
